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![Gregory CLEMENT](/assets/img/avatar_default.png)
Level IRQ handlers and edge IRQ handler are managed by tow different
sets of registers. But currently the driver uses the same mask for the
both registers. It lead to issues with the following scenario:
First, an IRQ is requested on a GPIO to be triggered on front. After,
this an other IRQ is requested for a GPIO of the same bank but
triggered on level. Then the first one will be also setup to be
triggered on level. It leads to an interrupt storm.
The different kind of handler are already associated with two
different irq chip type. With this patch the driver uses a private
mask for each one which solves this issue.
It has been tested on an Armada XP based board and on an Armada 375
board. For the both boards, with this patch is applied, there is no
such interrupt storm when running the previous scenario.
This bug was already fixed but in a different way in the legacy
version of this driver by Evgeniy Dushistov:
9ece8839b1
"ARM: orion: Fix for certain
sequence of request_irq can cause irq storm". The fact the new version
of the gpio drive could be affected had been discussed there:
http://thread.gmane.org/gmane.linux.ports.arm.kernel/344670/focus=364012
Reported-by: Evgeniy A. Dushistov <dushistov@mail.ru>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: <stable@vger.kernel.org> # v3.7 +
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
863 lines
24 KiB
C
863 lines
24 KiB
C
/*
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* GPIO driver for Marvell SoCs
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*
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* Copyright (C) 2012 Marvell
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*
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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* Andrew Lunn <andrew@lunn.ch>
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* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*
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* This driver is a fairly straightforward GPIO driver for the
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* complete family of Marvell EBU SoC platforms (Orion, Dove,
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* Kirkwood, Discovery, Armada 370/XP). The only complexity of this
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* driver is the different register layout that exists between the
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* non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
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* platforms (MV78200 from the Discovery family and the Armada
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* XP). Therefore, this driver handles three variants of the GPIO
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* block:
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* - the basic variant, called "orion-gpio", with the simplest
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* register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
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* non-SMP Discovery systems
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* - the mv78200 variant for MV78200 Discovery systems. This variant
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* turns the edge mask and level mask registers into CPU0 edge
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* mask/level mask registers, and adds CPU1 edge mask/level mask
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* registers.
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* - the armadaxp variant for Armada XP systems. This variant keeps
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* the normal cause/edge mask/level mask registers when the global
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* interrupts are used, but adds per-CPU cause/edge mask/level mask
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* registers n a separate memory area for the per-CPU GPIO
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* interrupts.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/irqdomain.h>
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#include <linux/io.h>
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#include <linux/of_irq.h>
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#include <linux/of_device.h>
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#include <linux/clk.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/irqchip/chained_irq.h>
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/*
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* GPIO unit register offsets.
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*/
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#define GPIO_OUT_OFF 0x0000
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#define GPIO_IO_CONF_OFF 0x0004
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#define GPIO_BLINK_EN_OFF 0x0008
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#define GPIO_IN_POL_OFF 0x000c
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#define GPIO_DATA_IN_OFF 0x0010
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#define GPIO_EDGE_CAUSE_OFF 0x0014
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#define GPIO_EDGE_MASK_OFF 0x0018
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#define GPIO_LEVEL_MASK_OFF 0x001c
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/* The MV78200 has per-CPU registers for edge mask and level mask */
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#define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
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#define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
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/* The Armada XP has per-CPU registers for interrupt cause, interrupt
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* mask and interrupt level mask. Those are relative to the
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* percpu_membase. */
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#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
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#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
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#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
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#define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
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#define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
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#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
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#define MVEBU_MAX_GPIO_PER_BANK 32
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struct mvebu_gpio_chip {
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struct gpio_chip chip;
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spinlock_t lock;
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void __iomem *membase;
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void __iomem *percpu_membase;
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int irqbase;
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struct irq_domain *domain;
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int soc_variant;
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/* Used to preserve GPIO registers across suspend/resume */
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u32 out_reg;
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u32 io_conf_reg;
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u32 blink_en_reg;
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u32 in_pol_reg;
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u32 edge_mask_regs[4];
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u32 level_mask_regs[4];
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};
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/*
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* Functions returning addresses of individual registers for a given
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* GPIO controller.
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*/
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static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
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{
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return mvchip->membase + GPIO_OUT_OFF;
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}
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static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
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{
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return mvchip->membase + GPIO_BLINK_EN_OFF;
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}
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static inline void __iomem *
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mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
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{
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return mvchip->membase + GPIO_IO_CONF_OFF;
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}
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static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
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{
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return mvchip->membase + GPIO_IN_POL_OFF;
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}
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static inline void __iomem *
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mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
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{
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return mvchip->membase + GPIO_DATA_IN_OFF;
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}
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static inline void __iomem *
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mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
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{
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int cpu;
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switch (mvchip->soc_variant) {
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case MVEBU_GPIO_SOC_VARIANT_ORION:
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case MVEBU_GPIO_SOC_VARIANT_MV78200:
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return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
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case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
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cpu = smp_processor_id();
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return mvchip->percpu_membase +
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GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
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default:
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BUG();
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}
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}
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static inline void __iomem *
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mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
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{
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int cpu;
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switch (mvchip->soc_variant) {
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case MVEBU_GPIO_SOC_VARIANT_ORION:
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return mvchip->membase + GPIO_EDGE_MASK_OFF;
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case MVEBU_GPIO_SOC_VARIANT_MV78200:
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cpu = smp_processor_id();
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return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
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case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
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cpu = smp_processor_id();
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return mvchip->percpu_membase +
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GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
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default:
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BUG();
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}
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}
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static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
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{
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int cpu;
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switch (mvchip->soc_variant) {
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case MVEBU_GPIO_SOC_VARIANT_ORION:
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return mvchip->membase + GPIO_LEVEL_MASK_OFF;
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case MVEBU_GPIO_SOC_VARIANT_MV78200:
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cpu = smp_processor_id();
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return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
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case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
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cpu = smp_processor_id();
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return mvchip->percpu_membase +
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GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
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default:
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BUG();
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}
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}
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/*
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* Functions implementing the gpio_chip methods
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*/
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static int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin)
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{
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return pinctrl_request_gpio(chip->base + pin);
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}
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static void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin)
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{
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pinctrl_free_gpio(chip->base + pin);
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}
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static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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unsigned long flags;
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u32 u;
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spin_lock_irqsave(&mvchip->lock, flags);
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u = readl_relaxed(mvebu_gpioreg_out(mvchip));
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if (value)
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u |= 1 << pin;
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else
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u &= ~(1 << pin);
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writel_relaxed(u, mvebu_gpioreg_out(mvchip));
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spin_unlock_irqrestore(&mvchip->lock, flags);
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}
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static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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u32 u;
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if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
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u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
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readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
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} else {
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u = readl_relaxed(mvebu_gpioreg_out(mvchip));
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}
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return (u >> pin) & 1;
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}
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static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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unsigned long flags;
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u32 u;
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spin_lock_irqsave(&mvchip->lock, flags);
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u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
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if (value)
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u |= 1 << pin;
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else
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u &= ~(1 << pin);
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writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
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spin_unlock_irqrestore(&mvchip->lock, flags);
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}
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static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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unsigned long flags;
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int ret;
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u32 u;
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/* Check with the pinctrl driver whether this pin is usable as
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* an input GPIO */
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ret = pinctrl_gpio_direction_input(chip->base + pin);
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if (ret)
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return ret;
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spin_lock_irqsave(&mvchip->lock, flags);
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u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
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u |= 1 << pin;
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writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
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spin_unlock_irqrestore(&mvchip->lock, flags);
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return 0;
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}
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static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
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int value)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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unsigned long flags;
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int ret;
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u32 u;
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/* Check with the pinctrl driver whether this pin is usable as
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* an output GPIO */
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ret = pinctrl_gpio_direction_output(chip->base + pin);
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if (ret)
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return ret;
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mvebu_gpio_blink(chip, pin, 0);
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mvebu_gpio_set(chip, pin, value);
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spin_lock_irqsave(&mvchip->lock, flags);
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u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
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u &= ~(1 << pin);
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writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
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spin_unlock_irqrestore(&mvchip->lock, flags);
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return 0;
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}
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static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
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{
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struct mvebu_gpio_chip *mvchip =
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container_of(chip, struct mvebu_gpio_chip, chip);
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return irq_create_mapping(mvchip->domain, pin);
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}
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/*
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* Functions implementing the irq_chip methods
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*/
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static void mvebu_gpio_irq_ack(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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u32 mask = ~(1 << (d->irq - gc->irq_base));
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irq_gc_lock(gc);
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writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
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irq_gc_unlock(gc);
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}
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static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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struct irq_chip_type *ct = irq_data_get_chip_type(d);
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u32 mask = 1 << (d->irq - gc->irq_base);
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irq_gc_lock(gc);
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ct->mask_cache_priv &= ~mask;
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writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
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irq_gc_unlock(gc);
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}
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static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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struct irq_chip_type *ct = irq_data_get_chip_type(d);
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u32 mask = 1 << (d->irq - gc->irq_base);
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irq_gc_lock(gc);
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ct->mask_cache_priv |= mask;
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writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
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irq_gc_unlock(gc);
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}
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static void mvebu_gpio_level_irq_mask(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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struct irq_chip_type *ct = irq_data_get_chip_type(d);
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u32 mask = 1 << (d->irq - gc->irq_base);
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irq_gc_lock(gc);
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ct->mask_cache_priv &= ~mask;
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writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
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irq_gc_unlock(gc);
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}
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static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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struct irq_chip_type *ct = irq_data_get_chip_type(d);
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u32 mask = 1 << (d->irq - gc->irq_base);
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irq_gc_lock(gc);
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ct->mask_cache_priv |= mask;
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writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
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irq_gc_unlock(gc);
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}
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/*****************************************************************************
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* MVEBU GPIO IRQ
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*
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* GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
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* value of the line or the opposite value.
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*
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* Level IRQ handlers: DATA_IN is used directly as cause register.
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* Interrupt are masked by LEVEL_MASK registers.
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* Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
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* Interrupt are masked by EDGE_MASK registers.
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* Both-edge handlers: Similar to regular Edge handlers, but also swaps
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* the polarity to catch the next line transaction.
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* This is a race condition that might not perfectly
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* work on some use cases.
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*
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* Every eight GPIO lines are grouped (OR'ed) before going up to main
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* cause register.
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*
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* EDGE cause mask
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* data-in /--------| |-----| |----\
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* -----| |----- ---- to main cause reg
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* X \----------------| |----/
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* polarity LEVEL mask
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*
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****************************************************************************/
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static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct irq_chip_type *ct = irq_data_get_chip_type(d);
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struct mvebu_gpio_chip *mvchip = gc->private;
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int pin;
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u32 u;
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pin = d->hwirq;
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u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
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if (!u)
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return -EINVAL;
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type &= IRQ_TYPE_SENSE_MASK;
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if (type == IRQ_TYPE_NONE)
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return -EINVAL;
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/* Check if we need to change chip and handler */
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if (!(ct->type & type))
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if (irq_setup_alt_chip(d, type))
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return -EINVAL;
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/*
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* Configure interrupt polarity.
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*/
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switch (type) {
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case IRQ_TYPE_EDGE_RISING:
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case IRQ_TYPE_LEVEL_HIGH:
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u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
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u &= ~(1 << pin);
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writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
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break;
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case IRQ_TYPE_EDGE_FALLING:
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case IRQ_TYPE_LEVEL_LOW:
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u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
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u |= 1 << pin;
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writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
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break;
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case IRQ_TYPE_EDGE_BOTH: {
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u32 v;
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|
|
v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
|
|
readl_relaxed(mvebu_gpioreg_data_in(mvchip));
|
|
|
|
/*
|
|
* set initial polarity based on current input level
|
|
*/
|
|
u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
|
|
if (v & (1 << pin))
|
|
u |= 1 << pin; /* falling */
|
|
else
|
|
u &= ~(1 << pin); /* rising */
|
|
writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq);
|
|
struct irq_chip *chip = irq_desc_get_chip(desc);
|
|
u32 cause, type;
|
|
int i;
|
|
|
|
if (mvchip == NULL)
|
|
return;
|
|
|
|
chained_irq_enter(chip, desc);
|
|
|
|
cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
|
|
readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
|
|
cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
|
|
readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
|
|
|
|
for (i = 0; i < mvchip->chip.ngpio; i++) {
|
|
int irq;
|
|
|
|
irq = mvchip->irqbase + i;
|
|
|
|
if (!(cause & (1 << i)))
|
|
continue;
|
|
|
|
type = irq_get_trigger_type(irq);
|
|
if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
|
|
/* Swap polarity (race with GPIO line) */
|
|
u32 polarity;
|
|
|
|
polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
|
|
polarity ^= 1 << i;
|
|
writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
|
|
}
|
|
|
|
generic_handle_irq(irq);
|
|
}
|
|
|
|
chained_irq_exit(chip, desc);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
#include <linux/seq_file.h>
|
|
|
|
static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
|
|
{
|
|
struct mvebu_gpio_chip *mvchip =
|
|
container_of(chip, struct mvebu_gpio_chip, chip);
|
|
u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
|
|
int i;
|
|
|
|
out = readl_relaxed(mvebu_gpioreg_out(mvchip));
|
|
io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
|
|
blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
|
|
in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
|
|
data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
|
|
cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
|
|
edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
|
|
lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
|
|
|
|
for (i = 0; i < chip->ngpio; i++) {
|
|
const char *label;
|
|
u32 msk;
|
|
bool is_out;
|
|
|
|
label = gpiochip_is_requested(chip, i);
|
|
if (!label)
|
|
continue;
|
|
|
|
msk = 1 << i;
|
|
is_out = !(io_conf & msk);
|
|
|
|
seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
|
|
|
|
if (is_out) {
|
|
seq_printf(s, " out %s %s\n",
|
|
out & msk ? "hi" : "lo",
|
|
blink & msk ? "(blink )" : "");
|
|
continue;
|
|
}
|
|
|
|
seq_printf(s, " in %s (act %s) - IRQ",
|
|
(data_in ^ in_pol) & msk ? "hi" : "lo",
|
|
in_pol & msk ? "lo" : "hi");
|
|
if (!((edg_msk | lvl_msk) & msk)) {
|
|
seq_puts(s, " disabled\n");
|
|
continue;
|
|
}
|
|
if (edg_msk & msk)
|
|
seq_puts(s, " edge ");
|
|
if (lvl_msk & msk)
|
|
seq_puts(s, " level");
|
|
seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
|
|
}
|
|
}
|
|
#else
|
|
#define mvebu_gpio_dbg_show NULL
|
|
#endif
|
|
|
|
static const struct of_device_id mvebu_gpio_of_match[] = {
|
|
{
|
|
.compatible = "marvell,orion-gpio",
|
|
.data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
|
|
},
|
|
{
|
|
.compatible = "marvell,mv78200-gpio",
|
|
.data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
|
|
},
|
|
{
|
|
.compatible = "marvell,armadaxp-gpio",
|
|
.data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
|
|
},
|
|
{
|
|
/* sentinel */
|
|
},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
|
|
|
|
static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
|
|
mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
|
|
mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
|
|
mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
|
|
|
|
switch (mvchip->soc_variant) {
|
|
case MVEBU_GPIO_SOC_VARIANT_ORION:
|
|
mvchip->edge_mask_regs[0] =
|
|
readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
|
|
mvchip->level_mask_regs[0] =
|
|
readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_MV78200:
|
|
for (i = 0; i < 2; i++) {
|
|
mvchip->edge_mask_regs[i] =
|
|
readl(mvchip->membase +
|
|
GPIO_EDGE_MASK_MV78200_OFF(i));
|
|
mvchip->level_mask_regs[i] =
|
|
readl(mvchip->membase +
|
|
GPIO_LEVEL_MASK_MV78200_OFF(i));
|
|
}
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
|
|
for (i = 0; i < 4; i++) {
|
|
mvchip->edge_mask_regs[i] =
|
|
readl(mvchip->membase +
|
|
GPIO_EDGE_MASK_ARMADAXP_OFF(i));
|
|
mvchip->level_mask_regs[i] =
|
|
readl(mvchip->membase +
|
|
GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_gpio_resume(struct platform_device *pdev)
|
|
{
|
|
struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
|
|
writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
|
|
writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
|
|
writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
|
|
|
|
switch (mvchip->soc_variant) {
|
|
case MVEBU_GPIO_SOC_VARIANT_ORION:
|
|
writel(mvchip->edge_mask_regs[0],
|
|
mvchip->membase + GPIO_EDGE_MASK_OFF);
|
|
writel(mvchip->level_mask_regs[0],
|
|
mvchip->membase + GPIO_LEVEL_MASK_OFF);
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_MV78200:
|
|
for (i = 0; i < 2; i++) {
|
|
writel(mvchip->edge_mask_regs[i],
|
|
mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
|
|
writel(mvchip->level_mask_regs[i],
|
|
mvchip->membase +
|
|
GPIO_LEVEL_MASK_MV78200_OFF(i));
|
|
}
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
|
|
for (i = 0; i < 4; i++) {
|
|
writel(mvchip->edge_mask_regs[i],
|
|
mvchip->membase +
|
|
GPIO_EDGE_MASK_ARMADAXP_OFF(i));
|
|
writel(mvchip->level_mask_regs[i],
|
|
mvchip->membase +
|
|
GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct mvebu_gpio_chip *mvchip;
|
|
const struct of_device_id *match;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct resource *res;
|
|
struct irq_chip_generic *gc;
|
|
struct irq_chip_type *ct;
|
|
struct clk *clk;
|
|
unsigned int ngpios;
|
|
int soc_variant;
|
|
int i, cpu, id;
|
|
int err;
|
|
|
|
match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
|
|
if (match)
|
|
soc_variant = (int) match->data;
|
|
else
|
|
soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
|
|
|
|
mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
|
|
GFP_KERNEL);
|
|
if (!mvchip)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, mvchip);
|
|
|
|
if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
|
|
dev_err(&pdev->dev, "Missing ngpios OF property\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
id = of_alias_get_id(pdev->dev.of_node, "gpio");
|
|
if (id < 0) {
|
|
dev_err(&pdev->dev, "Couldn't get OF id\n");
|
|
return id;
|
|
}
|
|
|
|
clk = devm_clk_get(&pdev->dev, NULL);
|
|
/* Not all SoCs require a clock.*/
|
|
if (!IS_ERR(clk))
|
|
clk_prepare_enable(clk);
|
|
|
|
mvchip->soc_variant = soc_variant;
|
|
mvchip->chip.label = dev_name(&pdev->dev);
|
|
mvchip->chip.dev = &pdev->dev;
|
|
mvchip->chip.request = mvebu_gpio_request;
|
|
mvchip->chip.free = mvebu_gpio_free;
|
|
mvchip->chip.direction_input = mvebu_gpio_direction_input;
|
|
mvchip->chip.get = mvebu_gpio_get;
|
|
mvchip->chip.direction_output = mvebu_gpio_direction_output;
|
|
mvchip->chip.set = mvebu_gpio_set;
|
|
mvchip->chip.to_irq = mvebu_gpio_to_irq;
|
|
mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
|
|
mvchip->chip.ngpio = ngpios;
|
|
mvchip->chip.can_sleep = false;
|
|
mvchip->chip.of_node = np;
|
|
mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
|
|
|
|
spin_lock_init(&mvchip->lock);
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(mvchip->membase))
|
|
return PTR_ERR(mvchip->membase);
|
|
|
|
/* The Armada XP has a second range of registers for the
|
|
* per-CPU registers */
|
|
if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
|
|
res);
|
|
if (IS_ERR(mvchip->percpu_membase))
|
|
return PTR_ERR(mvchip->percpu_membase);
|
|
}
|
|
|
|
/*
|
|
* Mask and clear GPIO interrupts.
|
|
*/
|
|
switch (soc_variant) {
|
|
case MVEBU_GPIO_SOC_VARIANT_ORION:
|
|
writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
|
|
writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
|
|
writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_MV78200:
|
|
writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
|
|
for (cpu = 0; cpu < 2; cpu++) {
|
|
writel_relaxed(0, mvchip->membase +
|
|
GPIO_EDGE_MASK_MV78200_OFF(cpu));
|
|
writel_relaxed(0, mvchip->membase +
|
|
GPIO_LEVEL_MASK_MV78200_OFF(cpu));
|
|
}
|
|
break;
|
|
case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
|
|
writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
|
|
writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
|
|
writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
|
|
for (cpu = 0; cpu < 4; cpu++) {
|
|
writel_relaxed(0, mvchip->percpu_membase +
|
|
GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
|
|
writel_relaxed(0, mvchip->percpu_membase +
|
|
GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
|
|
writel_relaxed(0, mvchip->percpu_membase +
|
|
GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
gpiochip_add(&mvchip->chip);
|
|
|
|
/* Some gpio controllers do not provide irq support */
|
|
if (!of_irq_count(np))
|
|
return 0;
|
|
|
|
/* Setup the interrupt handlers. Each chip can have up to 4
|
|
* interrupt handlers, with each handler dealing with 8 GPIO
|
|
* pins. */
|
|
for (i = 0; i < 4; i++) {
|
|
int irq = platform_get_irq(pdev, i);
|
|
|
|
if (irq < 0)
|
|
continue;
|
|
irq_set_handler_data(irq, mvchip);
|
|
irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
|
|
}
|
|
|
|
mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
|
|
if (mvchip->irqbase < 0) {
|
|
dev_err(&pdev->dev, "no irqs\n");
|
|
err = mvchip->irqbase;
|
|
goto err_gpiochip_add;
|
|
}
|
|
|
|
gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
|
|
mvchip->membase, handle_level_irq);
|
|
if (!gc) {
|
|
dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
|
|
err = -ENOMEM;
|
|
goto err_gpiochip_add;
|
|
}
|
|
|
|
gc->private = mvchip;
|
|
ct = &gc->chip_types[0];
|
|
ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
|
|
ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
|
|
ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
|
|
ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
|
|
ct->chip.name = mvchip->chip.label;
|
|
|
|
ct = &gc->chip_types[1];
|
|
ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
|
|
ct->chip.irq_ack = mvebu_gpio_irq_ack;
|
|
ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
|
|
ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
|
|
ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
|
|
ct->handler = handle_edge_irq;
|
|
ct->chip.name = mvchip->chip.label;
|
|
|
|
irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
|
|
IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
|
|
|
|
/* Setup irq domain on top of the generic chip. */
|
|
mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
|
|
mvchip->irqbase,
|
|
&irq_domain_simple_ops,
|
|
mvchip);
|
|
if (!mvchip->domain) {
|
|
dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
|
|
mvchip->chip.label);
|
|
err = -ENODEV;
|
|
goto err_generic_chip;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_generic_chip:
|
|
irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
|
|
IRQ_LEVEL | IRQ_NOPROBE);
|
|
kfree(gc);
|
|
|
|
err_gpiochip_add:
|
|
gpiochip_remove(&mvchip->chip);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver mvebu_gpio_driver = {
|
|
.driver = {
|
|
.name = "mvebu-gpio",
|
|
.of_match_table = mvebu_gpio_of_match,
|
|
},
|
|
.probe = mvebu_gpio_probe,
|
|
.suspend = mvebu_gpio_suspend,
|
|
.resume = mvebu_gpio_resume,
|
|
};
|
|
module_platform_driver(mvebu_gpio_driver);
|